I used my sister's PIS but she is the only one I would have used a used up pump from. That's awesome your work has hospital grade pumps- but you might want one at home to pump on the weekends too. I would look at manual pumps if you really don't want to spend a lot, but I've heard awesome things about the one Mare posted. Another thing about pumps is that they lose suction so they say after use for one child (if you are a working mom using it multiple times a day) you shou,d really get a new one.

thanks for the tips ladies.  I'll check the other brands out.